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From "Anton Kedin (JIRA)" <>
Subject [jira] [Commented] (BEAM-3345) [SQL] Reject Unsupported Joins
Date Thu, 11 Jan 2018 19:07:00 GMT


Anton Kedin commented on BEAM-3345:

Rejecting unsupported triggers conflicts with triggers created by the HOP/TUMBLE expressions.

Blocked by [BEAM-3360]

> [SQL] Reject Unsupported Joins
> ------------------------------
>                 Key: BEAM-3345
>                 URL:
>             Project: Beam
>          Issue Type: Task
>          Components: dsl-sql
>            Reporter: Anton Kedin
>            Assignee: Anton Kedin
> Related to .
> We don't know what meaningful join semantics is, in presence of multiple trigger firings.
I.e. in accumulating mode it will result in multiple duplicated join results, and in discarding
mode it will only join deltas, both of these scenarios seem to be super subtle and can lead
to misunderstanding and misuse by the end users.
> Until we have a way to implement a correct join semantics (e.g. using retractions) we
should reject unsupported window/trigger combinations. 

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